$x^3:x^3$
$\frac{\ln\left(3x\right)}{\sqrt{3x}}$
$25x^2-20xy$
$\frac{sin2x}{sinx}$
$\left(5b^{2}+7a^{2}\right)\left(-5b^{2}+7a^{2}\right)$
$\left(3x^2-7y\right)\left(5x-2y^2\right)$
$3\left(cosx\right)^2-\left(sinx\right)^2$
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